Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 228 (POWER SEAT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1335CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, with a scan tool clear the current and history DTC.
- Ignition ON, determine which motor set the DTC by operating the following motors one at a time in both directions. Check for the DTC to set between each motor test.
- Driver seat front vertical motor
- Driver seat rear vertical motor
- Driver seat horizontal motor
- Driver seat horizontal lumbar motor
- Driver seat vertical lumbar motor
- Driver seat recline motor
- Ignition OFF, disconnect the X1 harness connector at the seat adjuster motor assembly.
- Ignition OFF, test for less than 5.0 ohms of resistance between the UP/FORWARD control circuits and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
- Ignition OFF, test for less than 5.0 ohms of resistance between the DOWN/REARWARD control circuits and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
- Ignition OFF, disconnect the X1 harness connector at the seat recline motor.
- Ignition OFF, test for less than 5.0 ohms of resistance between the recline FORWARD/REARWARD control circuits and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
- Ignition OFF, disconnect the X2 harness connector at the lumbar motor assembly.
- Ignition OFF, test for less than 5.0 ohms of resistance between the recline FORWARD/REARWARD/UP control circuits and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
- Connect a test lamp between the motor control circuits of the inoperative motor.
- Command the inoperative motor in both directions with a scan tool. The test lamp should turn ON when commanding the motor to both directions.
- If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the MSM.
- If all circuits test normal, test or replace the appropriate seat motor assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.